JP2003041549A - Joint repair construction method for caisson - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make durable easy-maintenance repairs on a joint part of an existing caisson having a clearance. SOLUTION: This joint repair construction method for a caisson is used for mending the clearance 44 formed in the joint between the caissons 4 overlapped and connected to each other in the water for forming a breakwater. A form 1 having a pair of bag materials 2 and 2, which are arranged to be extended vertically along both side parts of a repaired part 441 to be repaired in the clearance 44, and a frame part 3, which holds a pair of bag materials 2 and 2 individually and is inserted into the repaired part 441 with the bag materials 2 and 2, is prepared. This repair method includes an insertion process of inserting the form 1 into the repaired part 441, an expansion process of expanding the bag materials by injecting mortar 23 into a pair of bag materials 2 and 2 inserted into the repaired part 441 for closing both side parts of the repaired part 441 respectively, and a filling process of filling a clearance between pair of expanded bag materials 2 and 2 with water-insoluble mortar 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson joint repairing method for repairing joints between caissons that are continuously joined in water.

[0002]

2. Description of the Related Art Conventionally, a breakwater is formed by connecting a plurality of caisson in water and joining them. A superstructure is applied to the joined caisson or a wave-dissipating block is arranged on the side facing the open sea. . By the way, in the breakwater constructed by the caisson in this way, due to uneven subsidence of the ground where the breakwater was built, a gap is created at the joints between the caisson, and waves enter from the outside sea outside the breakwater (outside the bay). Sediment may be deposited inside the breakwater. In this case, in order to close the joint gap, a rubber anti-sand joint plate is attached so as to cover the gap between the caisson joint portion from the inside of the bay.

[0003]

However, when the joint repair is carried out by using the rubber sandproof joint plate, the sand carried by the waves hits the sand joint plate covering the gap and damages the joint. It was scarce and it took time to maintain it. An object of the present invention is to repair a joint portion of an existing caisson having a gap, which has excellent durability and is easy to maintain.

[0004]

In order to solve the above problems, the invention described in claim 1 is, for example, as shown in FIGS. 1, 2 and 4.
As shown in FIG. 6, when a gap 44 is formed in the joint between the caissons 4 and 4 which are continuously joined in water, a caisson joint repairing method for repairing the joint gap 44 is used. In a state in which the pair of bag members 2 and 2 arranged so as to extend in the vertical direction along both sides of the repair portion 441 to be repaired and the pair of bag members 2 and 2 respectively extend in the vertical direction. Further, a mold for gap (for example, mold 1) that holds the bag materials 2 and 2 together with the bag materials 2 and 2 and is inflatable is prepared, and the mold for gap is repaired. Inserting step of inserting into the portion (see step S12 of FIG. 2, schematic view of the repaired portion of FIG. 4 (a) seen from the side), and a hardening material (for example, in the pair of bag materials inserted into the repaired portion). , Pour the fluid mortar23) to expand the bag material. Then, the expansion step of closing both sides of the repaired portion (step S13 in FIG. 2), and the hardening material (for example, fluid underwater non-separation between the pair of bag materials expanded at both ends of the repaired portion). Mortar 24)
And a filling step (step S13 in FIG. 2) for filling

According to the first aspect of the present invention, first, in the insertion step, a pair of bag members 2 arranged on both sides of the repair portion in the repair portion of the gap formed between the joints of the existing caissons. The mold having the frame part 3 and the frame part 3 is inserted. Next, in the expanding step, the bag material is expanded by injecting a hardening material into the pair of bag materials inserted into the repaired portion. The bag material inflated by the injection of the hardening material comes into close contact with the gap portions forming both end portions of the repair portion, closes both sides of the repair portion, and surrounds the central portion of the repair portion.
Then, in the filling step, the hardening material is filled between the pair of expanded bag materials, that is, the central portion surrounded by the pair of bag materials and the side wall of the repair portion. Thereby, the repaired portion is injected into the pair of bag materials and, in addition to the hardened material that is cured in a state where the pair of bag materials is inflated, the hardened material filled between the bag materials is cured, It is closed in a state corresponding to the shape of the repaired part. Therefore, the repair part of the joint gap is
Since it is repaired by being closed by the hardened material filled in the mold for the gap, it has durability and unlike the conventional method, it is unlikely to be damaged even if it is hit by sand carried by waves, and maintenance is time-consuming. It can be done easily without calling. Further, the gap can be repaired simply by inserting the gap mold into the gap repair part and injecting the hardening material into the gap mold, and the work can be easily performed.

Here, the hardening material has a fluidity and hardens with the passage of time. For example, concrete,
Examples include mortar and cement milk. In particular, it is desirable to use underwater non-separable mortar as the hardening material filled between the bag materials inserted in the gap. Further, the caisson forms a structure such as a breakwater or a seawall by joining the caisson in water.

The invention according to claim 2 is a method for repairing a joint of a caisson according to claim 1, wherein, for example, as shown in FIGS. 2 to 6, the caisson is connected in series to form a breakwater. And the repaired portion 4 which is composed of a long member extending in the vertical direction and is repaired by the gap form 1
By being installed in the gap on the side of 41, the wave preventing member 8 for preventing the intrusion of waves from the open sea into the repair portion in the gap,
A frame 91 extending in the up-and-down direction and a bag member 92 that is inflatably attached along the extending direction of the frame are provided, and the bag member 92 is installed in a gap on the side of the repair portion 441, so that And a wave preventing member installation step (step S10) in which a sand preventive member 9 for preventing sand from entering the repaired part is prepared, and the wave preventive member is inserted and installed in a lateral gap on the sea side of the repaired part. , A sand preventive member installation step of inserting and installing a sand preventive member between the wave preventive member installed in the gap and the repair portion, and injecting a fluid or a liquid into the bag member of the sand preventive member to expand the bag member (Step S10), and the inserting step (Step S12 in FIG. 2) is performed after the wave preventing member installing step and the sand preventing member installing step.

According to the second aspect of the present invention, before the inserting step, the wave preventing member installing step of inserting and installing the wave preventing member in the lateral gap of the repaired portion on the open sea side, and the gap Insert the sandproofing member between the installed waveproofing member and the repaired part, install it, inject the fluid or liquid into the bag material of the sandproofing member to expand the bag material, and install it in the place where the sandproofing member is installed. And the sand-prevention member installation step of blocking the intrusion of sand from the open sea into the repaired portion in the gap to be performed adjacent to the sand-prevention member installed in the gap after the sand-prevention step. When inserting the work mold into the repaired part of the gap, the work of inserting the mold for the gap can be easily performed without the intrusion of waves or sand into the repaired part from the open sea.

According to the third aspect of the present invention, for example, as shown in FIGS. 7 to 9, the caisson 4 is joined continuously in water.
In the caisson joint repair method for repairing the joint gap when a gap 44A is formed in the joint between A and 4A, a bag body 11 inserted into the gap and a frame for holding the bag body in a flat plate shape. An interstitial bag-shaped form 10 having a portion 20 and an insertion step of inserting the interstitial bag-shaped form into a joint gap; and curing the inside of the interstitial bag-shaped form inserted in the gap. And a step of inflating the bag body by filling the material.

According to the third aspect of the present invention, in the inserting step, the bag-shaped mold for the gap is inserted into the joint gap, and then in the expanding step, the bag-shaped mold for the gap is inserted. Since the bag body of the frame is filled with the hardening material to expand the bag body, the expanded bag body is brought into close contact with the repaired part, and the hardening material filled in the bag body while the bag body is brought into close contact with the repaired part. Can be solidified, and the repaired portion can be closed in a state corresponding to the shape. Therefore, the repair portion of the joint gap is repaired by being closed by the bag body and the hardened material in the bag body, so that the bag has durability and is different from the conventional one even if the sand carried by the waves hits it. It is less likely to be damaged and can be easily maintained. Further, the joint gap can be repaired by simply inserting the gap bag-shaped mold into the repaired portion of the gap and injecting the hardening material into the bag-shaped mold, which facilitates the work. The caisson is connected in water to form a structure such as a breakwater or a seawall, and the hardening material may be the same as the hardening material described above.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. [First Embodiment] The joint repairing method for caisson in the first embodiment is such that when a joint has a gap between jointed caissons, a joint having a gap is formed. The repair is performed using a frame, and the process of repairing such joints will be described mainly with reference to FIGS. 2 to 6. In this embodiment, the breakwater 40 (see FIGS. 3 and 4) is constructed by connecting a plurality of caissons in series.

First, a formwork used in this caisson joint repair method will be described. A formwork 1 shown in FIG. 1 is a gap 4 formed between joints between caissons 4 forming a breakwater (see a schematic view of the repaired portion of FIG. 3C viewed from the front side).
No. 4 repair portion 441, that is, the portion to be closed is formed so as to be insertable. This formwork 1 comprises a pair of long bag materials 2, which are vertically arranged along both sides of a repaired portion of a gap.
2, a pair of bag members 2 and 2 are held in a vertically extending state with a predetermined gap therebetween, and a square frame portion 3 that is inserted together with the bag member 2 into a gap.

The bag member 2 is composed of a long and flexible bag-shaped member extending in the vertical direction, and the length thereof is from the bottom of the existing caisson 4 (see FIG. 6) to the upper surface to be a workplace. The length is longer than the length of, and an opening is provided at the upper end. In addition, the bag material 2 is configured, for example, by closing the tip of a water supply hose made of vinyl chloride, and is arranged in parallel with each other at a predetermined interval. The holding frame member 31 of the frame portion 3 is attached along each of them. The predetermined interval between the bag materials 2 corresponds to the lateral length of the gap to be repaired.

The holding frame member 31 is made of a thin long flat plate member (here, flat steel), is bent from the lower end portion to the lower end of the bag member 2, and is attached to the lower end edge of the bag member. The curved portion 31a is provided. The bent portion 31a is also made of a thin flat plate member similar to the holding frame member 31. Each of the holding frame member 31 and the bent portion 31a is formed by stacking two sheets, and as shown in FIG. 1C, the bag member 2 is inflatable so as to sandwich the side edge of the bag member 2 (see FIG. 1).
It is joined with a bolt nut 21 in (c) shown by an imaginary line. With this holding frame material 31, the bag material 2
Is inflatable and the rigidity is maintained by reinforcing the lower edge and the side edge of the bag material 2 which are orthogonal to each other, so that the bag material 2 twists when the formwork 1 is inserted into the gap. Instead, it is arranged in the gap in a state of vertically extending from the lower end to the upper end of the repaired portion.

The holding frame members 31 are attached to the opposite side edges of the bag member 2 arranged at a predetermined interval, and the holding frame members 31 and the connection frame member 32 connecting the frames together form a frame. It constitutes part 3. The connection frame member 32 is laid between the upper and lower end portions of the holding frame member 31 facing each other at right angles to the extending direction of the holding frame member 31 and parallel to each other. The holding frame member 31 and the connection frame member 32 Thus, the frame portion 3 is formed in a flat plate-like substantially square frame shape. The connection frame member 32 is also made of a thin flat plate member (flat steel) similar to the holding frame member 31, and the flat steel has, for example, a thickness of about 6 mm and a width of 50 mm. The frame portion 3 has a thickness of, for example, a little less than about 3 cm, which is the length of the bolt nut 21, so that the frame portion 3 can be inserted into a gap having a width of 3 cm or more.

Next, a caisson joint repairing method using the mold 1 will be described with reference to a flow chart shown in FIG. 2 for explaining the caisson joint repairing method. As described above, the caisson joint repair method according to the present embodiment is used in the existing breakwater constructed by joining the caisson in water and joining the caisson joints due to uneven settlement. The description will be made assuming that the gap created in 1 is repaired. Therefore, the breakwater installs a base stone on the specified seabed ground, arranges a crushed stone from the top of this installed stone, levels it, joins the caisson side by side, and joins the joined caisson. It was constructed by applying a superstructure on top of. In addition, a breakwater block is installed on the open sea side of this breakwater, that is, outside the bay,
The root block 7 is installed inside, that is, adjacent to the inside of the bay of the caisson 4 shown in FIG. 3 (a). Further, adjacent to the caisson 4, soil is piled up as the covering material 5 so as to cover the upper part of the root block 7 and the tip of the discarded stone 72.

First, in step S1, in order to repair the joints between the existing caissons forming the breakwater, which have gaps caused by uneven subsidence or the like, the situation near the tip of the caisson forming the joints, etc. In order to investigate In step S2, as shown in the schematic view of the repaired portion of FIG. 3A viewed from the side surface side, the covering material 5 located below the joint portion between the caissons 4 in which a gap is formed is dug. This floor excavation work is carried out on the sea by a work boat 62 equipped with an excavator 61.
The work is carried out by the excavator 61 from above the work boat 62.

The earth and sand excavated in this floor excavation work is the work boat 6
2 is transported by sea (step S3) and used for forming beach nourishment (step S4) at a predetermined coastal location. Block 7 for solidifying the work of steps S2 to S4
Are exposed until the root block 7 is exposed, and the process proceeds to step S5. In step S5, FIG.
As shown in the schematic view of the repaired portion of the caisson 4 seen from the side, the rooting block 7 installed adjacent to the tip 41 of the caisson 4 is removed using a crane 65 or the like on the work boat 64, and a predetermined portion is removed. Place it temporarily in a place. Here, it is temporarily placed on the seabed 50 near the tip of the covering material 5. Then, after removing the rooting block 7, the process proceeds to step S9.

On the other hand, in the breakwater 40, as shown in steps S6 to S8, while the steps S1 to S5 described above are performed, the joint portion of the caisson 4 is exposed upward, so that the caisson 4 having the gap 44 is formed. The superstructure 42 on the joint part of the (step S6: FIG.
(See (c)). The superstructure 42 portion demolished in step S6 is transported to an industrial waste site by a transportation vehicle such as a truck 66 shown in FIG. 3C (step S6).
7), treated as industrial waste (step S8).
After performing the processes of steps S6 to S8 described above, the process proceeds to step S9.

In step S9, as shown in the schematic view of the repaired portion of FIG. 3 (d) seen from the side, a sand cleaning operation and a joint cleaning operation are performed to remove sand and the like in the joint portion where the gap 44 is formed. . As the sand cleaning work in the joint, the high jet (high-pressure water stream) device 28 for injecting a high-pressure water stream from the caisson top 43 where the joint gap 44 is exposed is used to form the gap 44.
The sand is blown off within the surrounding superstructure 42 top end 42a and caisson gap 44, and a suction device (air lift) is applied from the water inside the bay.
The sand is absorbed using 67 or the like. In the joint cleaning operation, after the joint sand cleaning operation, a long rod 68 or the like is moved up and down in the joint gap 44 to remove the adhered substances such as oyster shells attached to the joint gap. When removing the oyster shell in the joint, the iron plate may be moved up and down in the joint using a crane.

In step S10 following step S9,
As shown in the schematic view of the repaired portion of FIG. 3 (e) viewed from the front side, the repaired portion 4 closed in the gap 44 of the joint portion.
41, in detail, in a gap 44 on the open sea side of the repair portion 441 of the gap 44 to be repaired by the formwork 1, the wave guide (wave preventive member) 8 and the sand prevent guide (sand preventive member). ) 9
And, that is, inserted and installed (wavebreak member installation process, sand protection member installation process).

Here, the wave preventing guide 8 and the sand preventing guide 9 will be described. The breakwater guide 8 is inserted into the joint gap 44 of the caisson 4 to prevent waves from coming from the open sea to the repaired portion 441 along the gap 44. It consists of a rod-shaped member. Here, a long channel steel which can be inserted into the gap 44 is used as the wave guide 8.

The sand protection guide 9 is inserted into the joint gap 44 of the caisson 4 so as to be adjacent to the wave guide 8, and the inserted gap portion is closed to repair the portion from the open sea through the gap 44. This is to prevent sand from entering the 441. Specifically, as shown in FIG. 5, the sand protection guide 9 includes a frame 91 that is inserted into the gap 44 so as to extend in the vertical direction, and a bag that is inflatably attached along the extending direction of the frame 91. It has a material 92.

The frame 91 is made of a thin long flat plate member (here, flat steel), and is bent at the long side portion 91a fixed along the side edge of the bag material 92 and the tip of the long side portion 91a. , A bent portion 91b fixed along the lower edge of the bag material 92
Have and. The long side portion 91a and the bent portion 91b are
Each of the flat steels is formed by stacking two flat steels, and these two flat steels are the same as in the state where the holding frame material 31 is attached to the side edge of the bag material 2 (see FIG. 1C). The side edges of the bag material 92 are sandwiched so that they can be inflated, and they are joined by bolts and nuts 21.

The bag material 92 has substantially the same structure as that of the bag material 2 described above except that the total length is different. The bag material 92 is flexible and has an open upper end. The length of the bag material 92 is such that, when the bag material 92 is inserted into the gap 44, the upper end thereof protrudes upward from the top end 43 of the caisson which constitutes the joint portion, and here, it is substantially the same as the length of the wave guide 8. It has become a length. As described above, since the bag material 92 is inflatable and the frame 91 reinforces the orthogonal lower edge and side edge of the bag material 92 to maintain rigidity, the bag material 92 is twisted in the gap 44. Can be inserted without
The repair portion 441 can be arranged in the gap 44 in a state of extending in the vertical direction from the lower end to the upper end.

That is, in step S10, the above-mentioned wave preventing guide 8 is installed by inserting it from the top end 43 side to the side of the repair portion 441 on the open sea side in the gap 44 at the joint portion (wave preventing member installing step). Then, the sand-prevention guide 9 is inserted from the top end 43 side and installed adjacent to the wave-prevention guide 8 installed in the gap 44. Further, the bag material 92 of the sand protection guide 9
A fluid or a liquid (here, water) is injected into the inside of the bag to fill it, and the bag material 92 is inflated. The bag material 92 that has expanded in the gap comes into close contact with both wall portions facing each other in the installed portion and the gap 4
The open sea and the repaired part 441 are cut off in 4 to prevent sand from flowing into the repaired part 441 from the open sea (sand protection member installation step), and the process proceeds to step S12.

Further, in step S11, the above-mentioned mold 1 is manufactured in advance, and it is carried into the site, and then, as shown in FIG.
As shown in (a), the repaired portion 4 of the gap 44 at the joint portion
It builds in 41 (step S12: insertion process). Here, it is built so as to be adjacent to the existing sand protection guide 9. A hardening material, here mortar 23, is injected into the bag material 2 of the formwork 1 built in the repaired part 441 (step S13). As a result, the bag material 2 filled with the mortar 23 inflates in the gap and comes into close contact with the side wall of the gap, and closes the inside of the bay and the outside of the bay at the location where it is placed (expansion step).

Then, crushed stones are put between the bag materials 2 inflated in the gaps 44 so as to close the gaps of the caisson foundation waste stones. Then, as shown in the schematic view of the repaired portion of FIG. 4 (b) viewed from the front side between the expanded bag materials 2, a hardening material 24 such as cement milk, mortar or concrete is filled (step S13) and repaired. The portion 441 is completely closed. At this time, the frame portion 3 having the holding frame material 31 and the connection frame material 32 is buried. In this embodiment, the water-separable mortar (fluidized mortar) is used as the hardening material 24 filled between the bag materials 2 arranged in the repair part 441. FIG. 6 shows a state in which the repaired portion 441 of the gap 44 is completely closed by using the mold 1.

In FIG. 6, a crushed stone 71 is placed at the lower end of the mold 1 before filling the underwater non-separable mortar 24 between the inflated bag members 2. The gap between the lower end of the mold 1 and the foundation stone 72 and the crushed stone 73 is closed. When building the formwork 1 into the repaired part 441 of the gap 44, the wave guide 8 and the sand preventive guide 9 are installed on the side of the open sea side of the repaired part so that waves and sand enter the repaired part 441 from the open sea. Since the work is prevented, the work of building the mold 1 can be easily performed, and the work does not take time. In addition,
After the mold 1 is built in the wave guide 8 and the sand preventer 9, the underwater non-separable mortar (fluidized mortar) filled between the pair of bag materials 2 and 2 is hardened and the repaired portion 411 is closed. , The wave-preventing guide 8 is pulled out, the water in the bag material 92 is drained, and the sand-proof guide 9 is pulled out. The extracted wave guide 8 and sand guide 9 can be used when repairing a gap formed between joints of other caissons.

Next, in step S14, as shown in FIG.
As shown in the schematic view of the repaired part from the front side, in order to construct the superstructure above the caisson 4 that was removed earlier (specifically, only the removed part), formwork 74 for the superstructure is arranged. At the same time, the support work 75 for constructing the superstructure is assembled. Next, in step S15, as shown in the schematic view of the repaired portion of FIG. 4 (d) seen from the front side, concrete 29 is placed in the mold 74 installed on the upper part of the caisson 4, and after the placing. In step S16, the support 75 for the superstructure is dismantled and the form 74 is dismantled. The work from step S14 to step S16 is
The whole superstructure is constructed by repeating the process as needed for each place where the superstructure is constructed. In this way, step S1
After constructing the superstructure by repeating 4 to step S16, in step S16, as shown in the schematic view of the repaired portion of FIG.
The work is completed by installing the rooting block 7 at a predetermined position, that is, the glue tip 41 of the caisson 4 by using 9.

According to the above caisson joint repairing method, the gap 44 formed in the joint between the existing caisson 4 and the formwork 1 is formed.
The mortar 23 is built in (inserted) into the repaired portion 441 of the mortar 23, and the mortar 23 is injected into the pair of bag members 2 and 2 to inflate the repaired portion 44
Repairing part 4 by filling both sides of 1 and injecting water-separable mortar 24 between bag materials 2 and 2 that have expanded in the gap
Since 41 is completely closed, the joint portion can be repaired without damaging the existing caisson 4 itself. In addition, the formwork 1 can be manufactured according to the shape of the gap generated in the joint, and the caisson 4, due to the uneven settlement of the ground, can be produced.
Whatever gaps are created in the four joints, the joints can be repaired by suitably closing the gaps.

Further, since the formwork 1 is composed of only the bag material 2 and the frame portion 3, the construction cost can be reduced. In particular, in this embodiment, a PVC hose for water supply is used as the bag material 2, and a thin and thin flat steel is used as the frame to reduce the manufacturing cost of the formwork 1.

Further, the joint gap 44 repaired by the mold 1 (specifically, the repaired portion 441 of the joint) is the mortar 2.
3. Because it is blocked by the underwater non-separable mortar 24, unlike the method of closing the gap that connects the open sea (outside the bay) and the inside of the bay with a rubber sheet, the sand carried by the waves and waves coming from the open sea It is hard to be damaged by things such as the above, and can be repaired with high durability and easy maintenance.
In this way, it is possible to reduce the remarkable sedimentation phenomenon that occurs in the bay of the breakwater 40 formed by the caisson 4 due to the effect of the permeated water from the gap 44 formed in the joint of the caisson 4.

[Second Embodiment] A caisson joint repair method according to the second embodiment will be described with reference to FIGS. 7 and 8. Like the first embodiment, the caisson joint repair method of the second embodiment is similar to the first embodiment in that when a gap is created in the joints of the caisson joined continuously in water, a gap is repaired. The gap-shaped form 10 is used to close the repaired portion.

First, the bag-like mold for the gap will be described.
The gap bag-shaped form frame 10 shown in FIG. 7 includes a flexible bag body 11 and a frame portion 20 that holds the bag body 11 in a flat plate shape. The bag body 11 is formed by processing canvas into a bag shape, for example, and has an opening at the upper end. Then, it can be expanded by applying pressure inside or by injecting gas or liquid. The bag body 11 has a length that is substantially the same as or larger than the lateral length and the vertical length of the gap formed in the joint portion between the caissons, or the repair portion to be repaired in the gap, and the bag body 11 is inside thereof. A frame portion 20 for holding the plate in a flat plate shape is provided.

The frame portion 20 is formed by assembling thin and long flat plate-like members in the bag body 11 in a lattice shape. Here, flat steel is used as the flat member, and they are joined by welding. That is, the bag-shaped mold 10 for this gap
In a normal state, that is, in a state before the bag body 11 is inflated, the plate body is in a flat plate shape, and since the bag body 11 is held in a flat plate shape by the frame portion 20, it is not twisted in the gap. Can be inserted into.

Next, referring to FIG. 8, a bag-like formwork 1 for gaps.
A method for repairing the gap generated in the joint portion of the existing caisson using 0 will be described. The gap 44A to be repaired shown in FIG. 8 (a) is an existing breakwater constructed by connecting and joining the caisson 4A, 4A in water, and the caisson 4A, 4A,
It occurred at the joints of 4A. This gap 4
4A has a shape that widens toward the lower ends of the caissons 4A and 4A and narrows upward.

In the caisson joint repair method of the second embodiment, steps S1 to S9 performed in the repair method of the first embodiment and step S1 are performed.
The steps after 4 are the same. Therefore, in the following, in the gap, the bag-shaped mold 1 for the gap is added to the repair portion of the gap.
Only the step of building 0 and closing the repaired portion of the gap will be described, and description of the other steps will be omitted.

First, as shown in FIG. 8A, similarly to the caisson 4 described above, the gap 44A formed in the joint portion between the existing caisson 4A installed on the foundation stone 72 is discarded.
After performing the sand cleaning in the joint and the joint cleaning work to close the joint, the portion to be closed in the gap 44A, that is, the repair portion 44
The bag-shaped mold 10 for gap is built in 1A from the caisson top end 43A (insertion step). As a process before building the bag-like mold 10 for the gap, the gap 44A in the joint portion of the caisson is formed.
So that it is exposed at the top 43A of the caisson 4A, 4A,
Similar to the construction method of the first embodiment described above, the superstructure is removed and the rooting block (not shown) is also removed. Then, the gap bag-shaped mold 10 built in the repaired portion 441A of the gap 44A has its lower end abutting the same level as the caisson lower end, that is, the upper face of the foundation stone 72 forming the bottom face of the gap. Shall be built.

Next, in order to efficiently inject a hardening material such as mortar into the bag 11 at the caisson top 43A portion of the upper edge of the gap 44A, a core 442 having a diameter larger than that of the gap 44A and penetrating into the gap is formed. Form. Then, the tip of the hopper 27 (see FIG. 8B) is inserted from the caisson top end 43A into the inside of the bag 11 inside the core 442. Next, as shown in FIG. 8B, the underwater non-separable mortar (hardening material) 24 is injected and filled into the bag body 11 via the hopper 27. Thereby, the bag body 11 is inflated (expanding step), and is cured in a state where the outer surface of the bag body 11 is in close contact with the inner wall of the repaired portion 441A. At this time, the underwater non-separable mortar 24 is injected so as to be filled up to the upper end of the bag body 11. In this way, the repaired portion 441A is closed, and the joint gap 4
4A repair work is completed.

As described above, according to the caisson joint repairing method using the bag-shaped mold 10 for gaps, since the bag-shaped mold 10 for gaps is normally flat, that is, sheet-shaped, the joint portions between the caissons are Even if the above-mentioned formwork 1 cannot be inserted because the width of the gap created in the gap is narrow, the repaired portion 4 of the gap 44A
41A can be closed. Similar to the method for repairing the caisson joint of the first embodiment described above, this construction method can repair the joint portion without damaging the existing caisson 4 itself, and the shape of the gap formed in the joint. The bag-shaped mold 10 for the gap can be manufactured according to the above, and the shape of the gap created in the joints of the caisson 4A, 4A due to uneven settlement of the ground is fitted to suitably close the gap to repair the joint. It can be carried out. In addition, although the bag-shaped mold 10 for gaps is built in the repair portion 441A of the gap 44A, it may be built in the entire gap 44A.

Further, since the bag-like mold 10 for the gap is composed only of the bag material 11 and the frame 20, the manufacturing cost can be reduced and the mold 1 using the bolt nut 21 for the frame 3 can be achieved. It can be formed thinner and can be inserted into a narrow gap where the mold 1 cannot be inserted. For example, if the thickness of the flat steel forming the frame 20 is set to about 4.5 mm and the thickness of the bag-like mold for gap 10 at the time of unexpanded insertion is set to about 7 mm, a gap larger than 7 mm is 3 cm. The gap can be closed by inserting (building in) the following gap.

Further, since the joint gap 44A (specifically, the repair portion 441A of the gap) repaired by the formwork 10 is closed by the underwater non-separable mortar 24, it is connected to the open sea (outside the bay) and the inside of the bay. Unlike the method of closing the gap that communicates with the rubber sheet, it is unlikely to be damaged by waves coming from the open sea or sand carried by the waves, and it is highly durable and can be easily maintained for maintenance. It is possible to reduce the remarkable sedimentation phenomenon that occurs in the bay of the breakwater formed by the caisson 4A due to the effect of permeated water from the gap 44A or the gap formed in the joint of the caisson 4A.

In the above embodiment, when a gap is created in the joint portion of the caisson in the breakwater formed by joining the caisson in water and joining them,
Although it has been described that the gap is repaired, the invention is not limited to this, and the seawall may be formed by joining caisson in series and joining. Further, the shape of the caisson and the like are also arbitrary, and it is needless to say that other specific constituent elements can be appropriately changed.

[0045]

According to the first aspect of the present invention, the repaired portion is formed into the shape of the repaired portion by curing the bag material in which the hardening material is injected and the hardening material injected between the bag materials. It is closed by the corresponding gap form. Therefore, the repaired repaired portion has durability, unlike the conventional case, is less likely to be damaged by hitting the sand carried by the waves, and the maintenance can be facilitated. According to the invention of claim 2, the same effect as that of the invention of claim 1 can be obtained, and after the sand-proofing step, the mold for gap is adjacent to the sand-proofing member installed in the gap. When inserting into the repair part of the gap, the work of inserting the formwork for the gap can be easily performed without waves or sand entering the repair part from the open sea.

According to the third aspect of the present invention, the bag body filled with the curing material and expanded is brought into close contact with the repair portion, and the bag body is filled with the cured material while being kept in close contact with the repair portion. Since the material is solidified, the repaired portion is repaired by being closed by the bag-shaped mold in a state corresponding to the shape. Therefore, the repaired portion has durability, and unlike the conventional case, it is less likely to be damaged by being hit by sand carried by the waves, and maintenance can be facilitated.

[Brief description of drawings]

1A and 1B are views showing an example of a mold used in a caisson joint repair method of a first embodiment to which the present invention is applied, in which FIG. 1A is a side view of the mold, and FIG. Figure,
(C) is a figure which shows the connection state of a bag material and a holding frame material.

FIG. 2 is a flowchart showing the steps of a joint repair work to which the caisson joint repair method of the first embodiment is applied.

FIG. 3 is a schematic diagram illustrating a process of a caisson joint repair method.

FIG. 4 is a schematic diagram illustrating a process of a caisson joint repair method.

FIG. 5 is a view showing an example of a sand protection member used in the joint repair method of the caisson, (a) is a front view of the sand protection member,
(B) is the same top view.

FIG. 6 is a schematic configuration diagram showing a state in which a gap generated in a joint is repaired.

FIG. 7 is a diagram showing an example of a bag-like formwork for gaps used in a caisson joint repairing method according to a second embodiment of the present invention, (a) being a side view of the formwork, (b) ) Is the same front view.

FIG. 8 is a diagram illustrating a process of repairing joints of caisson using the bag-shaped mold for gaps shown in FIG. 7, in which (a) shows the bag-shaped mold for gaps 10 built in the repaired portion of the gap. It is a schematic front view which shows the packed state, (b) is a schematic front view which shows the state which filled the hardening | curing material in the bag body.

[Explanation of symbols]

1 formwork 2 bags 3 frame part 4,4A caisson 8 Wave break guide (wave break member) 9 Sand protection guide (sand protection member) 10 Bag-shaped formwork for gaps 11 bags 20 frame part 44,44A Joint gap 441 Repair part of the gap 441A Gap repair part (gap)

Continued front page    (72) Inventor Eiji Shimizu             4-1-1 Koraibashi, Chuo-ku, Osaka City, Osaka Prefecture               Toyo Construction Co., Ltd. F-term (reference) 2D018 BA12

Claims (3)

[Claims] 1. A caisson joint repair method for repairing a gap between joints when a joint is formed between the caissons joined in water and a gap is formed between both sides of a repair portion to be repaired. A pair of bag members arranged so as to respectively extend in the vertical direction,
A gap form frame is provided that holds each of the pair of bag members in an inflatable state and is inflatable, and includes a frame part that is inserted into the repair part together with the bag member. An inserting step of inserting a repair material into the repair portion, inflating the bag material by injecting a hardening material into the pair of bag materials inserted into the repair portion, and an expanding step of respectively closing both side portions of the repair portion, A caisson joint repairing method, comprising a filling step of filling a hardening material between a pair of bag materials that have expanded at both ends of the repaired portion. 2. The caisson joint repairing method according to claim 1, wherein the caisson is formed by joining the caissons in series to form a breakwater, and the caisson is composed of a long member extending in the vertical direction. By installing in the gap on the side of the repair part to be repaired by the frame, a wave preventing member that prevents waves from entering the repair part from the open sea in the gap, and a frame extending in the vertical direction, A bag member attached inflatable along the extending direction of the frame, and a sand-preventing member for preventing sand from entering the repair portion in the gap by being installed in a gap on the side of the repair portion. And a wave preventing member installation step of inserting and installing the wave preventing member in a gap on the side of the open sea side of the repair portion, and a sand barrier between the wave preventing member installed in the gap and the repair portion. Insert the member and install it, the bag of the sand protection member A caisson joint repair, further comprising a sand-proof member installation step of injecting a fluid or a liquid into the container to expand the insertion step, wherein the inserting step is performed after the wave-proof member installation step and the sand-proof member installation step. Construction method. 3. A caisson joint repairing method for repairing a gap between joints when the joints between the caisson jointed in water are filled with each other, and a bag body inserted into the gap and the bag. A gap bag-like mold having a frame portion for holding the body in a flat plate shape is prepared, and an inserting step of inserting the gap bag-like mold into the joint gap and the gap bag-like mold inserted in the gap A caisson joint repairing method, comprising: an expansion step of inflating the bag body by filling a hardening material into the bag body of the frame.